Facilitating Implicit Learning to Improve Neurorehabilitation in Stroke

Study Summary

Stroke is one of the leading causes of chronic disability in Veterans. Stroke is associated with significant loss of mobility, increased risk of falling, cardiovascular disease, depression and neuro-cognitive impairment. These deficits negatively impact the independent completion of the Activities of Daily Living (ADLs). Task-oriented training has emerged as the dominant therapeutic intervention in the rehabilitation of chronic stroke victims. The effectiveness of these interventions may be enhanced through facilitation of implicit knowledge rather than explicit knowledge. Specifically, implicit learning increases retention and improves transfer of the improved motor function outside of the lab environment. Moreover, implicit motor control reduces the burden imposed on cognitive resources as the skill is performed automatically (i.e. do not have to 'think' about it). The amount and type of feedback individuals receive while learning a new task (or relearning in the case of rehabilitation) has been shown to influence the type of learning (i.e. implicit or explicit). Thus the purpose of the current study is to determine the effect of different types of feedback during motor learning on the learning type and the resultant impact on functional outcomes (i.e. motor performance, retention, and cognitive workload) in chronic stroke patients.

Primary Outcome

Quality of motor behavior was indexed by the percentage of samples in which the participants were within the trained (i.e. optimal) trajectory. The trained trajectory was a 2cm wide channel in the shape of a half circle between two targets which were 25cm apart from each other. Therefore, the scale measure is a percentage which can range between 0 and 100%.

Conditions Studied

Interventions

• BEHAVIORAL Reaching Task

Study Locations (1)